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MATRIX ENVIRONMENTAL LABORATORIES <br /> ANALYSIS. BTEX SPIKE SUMMARY <br /> CLIENT: Western GEO <br /> CONTACT: V. Bennett Date Sampled: 12/18/92 <br /> COC No: 3696 Date Received: 12/21/92 <br /> Pro)ect No: USA #65 Date Extracted: N/A <br /> Sample ID: MS, MSD Date of Analysis: 12/21/92 <br /> Lab ID: 924490 Matrix: WATER <br /> CONC CONC PERCENT <br /> COMPOUND SPIKED MEASURED RECOVERY <br /> MS MSD MS MSD RPD <br /> BENZENE 20. 0 19. 3 18. 0 97$ 90% 7% <br /> TOLUENE 20. 0 19. 3 18. 0 9796 90% 7% <br /> *ETHYL BENZENE 20. 0 19. 1 17. 8 96% 89% 7% <br /> TOTAL XYLENES 60 . 0 57. 3 53. 4 96% 89% 7-% <br /> MS= MATRIX SPIKE <br /> MSD= MATRIX SPIKE DUPLICATE <br /> RPD-= RELATIVE PERCENT DIFFERENCE <br /> CONC= CONCENTRATION <br /> i <br /> 3017 KILGORE ROAD# 100 • RANCHO CORDOVA, CA 95742 PHONE (916) 635-3962 • FAX (916)635-9331 <br /> 4 <br />